But it is one thing to conclude that Catholicism is good and another to conclude that it is right. It is one thing to conclude that it is right and another to conclude that it is always right. I had never believed the tradition that is was diabolical; I had soon come to doubt the idea that it was inhuman, but that would only have left me with the obvious inference that it was human. It is a considerable step from that to the inference that it is divine. When we come to that conviction of divine authority, we come to the more mysterious matter of divine aid. In other words, we come to the unfathomable idea of grace and the gift of faith; and I have not the smallest intention of attempting to fathom it. It is a theological question of the utmost complexity; and it is one thing to feel it as a fact and another to define it as a truth.
—G. K. Chesterton